JP2011113721A - Method of manufacturing battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a battery pack, capable of exhibiting superior battery performance, by overcoming the problem of resin compositions overflowing outside, thereby reliably filling the resin compositions in an outer package case. <P>SOLUTION: A filling port 22 and an exhaust port 23 are provided on one edge of a rectangular parallelepiped rear case 2. A core component 4 made by arranging unit batteries 7a, 7b and a PCBA 5 in a holder 6 is housed between the rear case 2 and a front case 3. Funnels 8a, 8b are inserted into the filling port 22 and the exhaust port 23, respectively, and a fluid resin composition is filled from a funnel 8a side, and exhausted from the funnel 8b to execute a potting process. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a battery pack including a plurality of unit cells, and particularly relates to a technique for satisfactorily filling a resin inside an outer case while maintaining high appearance quality.

In recent years, battery packs obtained by packaging secondary batteries that can be repeatedly charged and used have become widespread. The battery pack is widely used as a main power source or backup power source for notebook personal computers, mobile phones, PDAs, and other various electronic devices.
A typical battery pack is a thin and square lithium-ion battery unit cell, and a protective circuit board is electrically connected to the unit cell and the power generation element (core component) assembled to the holder is used as the outer case. It is housed and sealed inside.

  In addition, after storing the power generation element inside the exterior case, a fluid resin composition using a reaction curable resin material or the like is poured from the outside as a potting agent through a predetermined filling port, and this is later added. A potting process for curing may be performed. The potting agent placed in this process ensures insulation between the components of the power generation element, and heat generated in the vicinity of the unit cell during driving is absorbed by the potting agent and effectively dissipated outside the battery pack. Can be expected. In addition, by making the outer case interior dense with a potting agent, so-called explosion-proof pack batteries can be used to prevent sparks inside the battery pack from splashing outside when an abnormality occurs and igniting external flammable substances. A preferred configuration is realized.

JP 2000-243364 A

However, in the potting process, there is a problem that the resin composition cannot be filled well when filling the exterior case, and the resin composition overflows to the outside.
The overflowing resin composition can be wiped off if it is in an uncured state immediately after the potting process. However, since it is a liquid, it is difficult to completely wipe it off, and it remains on the surface of the outer case not a little. On the other hand, once the resin composition is cured, it needs to be removed by a method such as scraping. In this case, since the cured resin has an adhesive force, the removal requires time and labor. In either case, there arises a problem that the appearance quality of the battery pack is impaired.

Such a problem is more noticeable when a relatively high viscosity resin composition is used because the filled resin composition is likely to overflow early before it accumulates in order from the bottom of the outer case. There is a tendency to become.
As described above, when the potting process is performed in the battery pack, there is still room for solving.

  The present invention has been made in view of the above problems, and prevents the problem that the resin composition overflows to the outside, and exhibits excellent battery performance by reliably filling the exterior case with the resin composition. It is an object of the present invention to provide a method for manufacturing a battery pack that can be expected.

  In order to solve the above problems, the present invention is a storage step of storing a power generation element in which a unit cell is disposed in an outer case, and a fluid resin composition is filled in a gap between the outer case and the power generation element. A potting battery manufacturing method that undergoes a potting step of curing and potting, wherein in the potting step, an exterior case provided with a filling port and an exhaust port is used, and the first tube body and the exhaust port are provided in the filling port. A resin filling sub-process for inserting the second tube body from the outside, filling the resin composition from the filling port through the first tube body, and exhausting the inside of the case from the exhaust port through the second tube body, The subsequent resin composition was cured, and the first tube and the second tube inserted in the outer case were removed, and a resin curing sub-process for sealing the filling port and the exhaust port was performed.

Here, the outer case used in the potting process has a rectangular parallelepiped shape, and the filling port and the exhaust port may be provided on the same end surface of the outer case.
Moreover, a power generation element including a holder can be used as the power generation element.
Moreover, a power generation element including a circuit board can be used as the power generation element.
Further, in the filling sub-process, the resin composition that has risen from the inside of the outer case to the inside of the second tubular body can be dropped into the gap.

  Furthermore, in the potting step, it is also possible to use at least one of a silicone-based resin, a modified silicone-based resin, and an epoxy-based resin composition as the resin composition.

  According to the method for manufacturing a battery pack of the present invention having the above characteristics, in the potting process, the first tubular body is inserted into the filling port of the outer case, and the fluid resin composition is supplied from the outside through the first tubular body. In addition, by inserting the second pipe body into the exhaust port and exhausting through the second pipe body, the resin composition can be correctly filled in the gap inside the outer case, and the resin composition is outside the outer case. It is possible to effectively prevent the problem that the appearance quality of the exterior case deteriorates due to adhesion.

In addition, a funnel can be used as each of the first and second tubular bodies.
Conventionally, when the viscosity of the resin composition used in the potting process is high, there is a problem that the resin composition overflows from the exhaust port before the resin composition is filled in order from the bottom of the outer case. In the present invention, by inserting the second pipe body into the exhaust port, it is possible to prevent the appearance quality from being deteriorated due to such leakage. In the present invention, it is possible to prevent the deterioration of the appearance quality due to the resin composition as described above, and the process of wiping off the adhered resin composition or removing it after curing is unnecessary. large.

  Furthermore, in the present invention, by providing the exhaust port of the outer case above the rising direction of the resin liquid level, even if the resin composition overflows from the exhaust port to the second pipe to some extent, The resin composition can be dropped again into the outer case and used for resin filling. Therefore, in addition to the effect of maintaining the appearance quality described above, there is also an advantage that an efficient potting process can be performed without waste of materials.

It is an external view of the battery pack according to the embodiment. It is an assembly drawing of the battery pack of the embodiment. It is a figure which shows the structure of a holder. It is sectional drawing of the battery pack of embodiment. It is a figure for demonstrating the structure of a rear case and the insertion direction of a funnel. It is a figure for demonstrating a potting process. It is sectional drawing of the battery for demonstrating the conventional subject which the bubble generate | occur | produced.

<Embodiment>
Hereinafter, embodiments of the present invention will be described. Of course, the present invention is not limited to the following configurations, and can be appropriately changed without departing from the technical scope of the present invention.
(Configuration of battery pack 1)
FIG. 1 is an external view ((a) shows a back side and (b) shows a front side) showing a configuration of a battery pack 1 according to the first embodiment.

The battery pack 1 is assumed to be a power supply target device here, and has an outer case in which a front case 3 having a flat main surface is fitted in an opening of a rear case 2. The rear case 2 and the front case 3 are both made of engineering plastics (ABS, PC, etc.) excellent in heat resistance, insulation and mechanical strength.
The rear case 2 has a rectangular parallelepiped shape (the “rectangular shape” here refers to not only a mathematically exact shape but also a box shape having a certain thickness). The outer surface is formed in a shape that takes into account the design of the power supply target device and the handling of the user, and a warning label 21 is attached to the main surface portion. Below the main surface portion, charging terminals 20 having positive and negative polarities are respectively exposed through a plurality of terminal windows 27. When charging the battery pack 1, the charging terminal 20 contacts the charger side and is electrically connected. On the other hand, a liquid injection port 22 and an exhaust port 23 are formed apart from each other on one end surface (the upper surface here) in the longitudinal direction (Z direction) of the rear case 2 (pack battery 1).

  Each of the liquid injection port 22 and the exhaust port 23 is a hole communicating with the interior of the rear case 2, and both are holes used in the potting process. In the battery pack 1, sealing is performed with a sealing seal 28 made of PET from the outside. Has been. The liquid injection port 22 is used as a port for filling the resin composition in the potting process. When the resin composition is filled into the battery pack 1 in the potting process, the exhaust port 23 efficiently exhausts the internal air and cures the resin in a state where the liquid level of the resin composition is horizontal. Used.

A latch (engaging portion) 33 that locks the mounted state after the battery pack 1 is mounted on the power supply target device is disposed below the rear case 2.
On the inner wall 24 of the rear case 2, rib groups 25 and 26 are formed for abutting and positioning the core component 4. Each of the rib groups 25 and 26 includes a plurality of plate-like ribs 25a to 25c and 26a to 26c (see FIGS. 2 and 4). Further, locking claws 241 and 242 for fixing the holder 6 are formed at both ends in the vertical direction (Z direction) of the rear case 2 (see FIG. 4).

The front case 3 corresponds to a portion that is mounted to face the power supply target device of the battery pack. On one of the main surfaces, a discharge terminal 30 and a rating label 31 are provided. On the other main surface, as shown in FIG. 2 (an assembly diagram showing the internal configuration of the battery pack 1), discharge terminal leads 9 for electrically connecting the discharge terminals 30 and the core component 4 are disposed. ing.
As shown in FIG. 2, a core component 4 that is a main power generation element is housed inside an exterior case composed of a rear case 2 and a front case 3.

The core component 4 is configured by arranging a PCBA (assembled protection circuit board) 5 and unit cells 7 a and 7 b in a plate-like holder 6. In the battery pack 1, as shown in the cross-sectional view of FIG. 4, a resin (potting agent) 70 is densely filled in the gap between the outer case and the core component 4 so as to embed the core component 4.
Here, the holder 6 is used as a component of the core part 4, but this is not essential and may be omitted as appropriate according to the design of the battery pack 1. In this case, the unit cells 7 a and 7 b can be directly assembled to the rear case 2 or the front case 3.

  The unit cells 7a and 7b are secondary cells, and square lithium ion batteries are used here, but the unit cells are naturally not limited to this. In addition, various secondary batteries such as a nickel metal hydride battery, a nickel cadmium battery, and a lithium ion polymer battery can be given. Further, the shape of the unit cells 7a and 7b is not limited to the cylindrical shape, and may be a square shape or the like. Moreover, the number of unit cells can also be set arbitrarily.

In the core component 4, the unit cells 7 a and 7 b are arranged in series using lead members 10 to 12 and are electrically connected to the PCBA 5.
Each of the lead members 10 to 12 is made of a conductive material such as nickel phosphate (NiP), and direct cell welding (resistance welding) is applied to the unit cells 7a and 7b, and solder welding is applied to the PCBA5. Electrically connected.

  PCBA5 is an assembled protection circuit board in which predetermined electric elements are mounted on a substrate made of a glass epoxy material. In order to appropriately charge and discharge the unit cells 7a and 7b, the unit cells 7a and 7b are temperature-controlled and output. Used for control purposes. For this reason, the PCBA 5 is mounted with a thermistor element, a PCT element that cuts off the power supply during thermal runaway, a microcomputer having a function of detecting the abnormality by calculating the remaining capacity, and the like.

  It is also possible to connect an LED element to the circuit of PCBA5, open a light emitting window of the LED element on the outer surface of the battery pack 1, and provide an LED indicator for indicating the remaining battery capacity of the LED element. PCBA5 is used for managing the unit cells 7a and 7b when a lithium ion battery is used for the unit cells 7a and 7b. However, when other secondary batteries are used for the unit cells. For example, PCBA5 may not be used.

3A and 3B are diagrams showing the configuration of the holder 6 ((a) is the front side, and (b) is the back side). The holder 6 is configured as a plate using the same resin material as the rear case 2 and the front case 3.
The first surface 60 is a surface on which the PCBA 5 is held, and is disposed facing the inner wall 24 of the rear case 2 inside the exterior case. A plurality of claws 69 that engage and hold the PCBA 5 are formed on both sides in the width direction. The second surface 61 is a surface on which the two unit cells 7a and 7b are arranged, and ribs (partitions) for partitioning the unit cells 7a and 7b at regular intervals along the Y direction at the center thereof. Ribs 68) are formed.

  Furthermore, rib groups 63 to 65 and 67 and ribs 66 are formed on the first surface 60 and the second surface 61 of the holder 6 so that the core component 4 and the PCBA 5 can be surrounded and positioned from the side surfaces, respectively. The rib groups 63, 64, 65, and 67 further include a plurality of plate-like ribs (63a to 63e, 64a to 64d, 65a, 65b, 67a to 67e, and 69a to 69e) at predetermined intervals along the Y direction. It is arranged in.

  Here, FIG. 4 is a cross-sectional view along the longitudinal direction of the battery pack 1. In the figure, for the sake of convenience, the appearance of the core component 4 is shown. As shown in the figure, the rib groups 63 to 65, 67 and the rib 66 are all in contact with the outer case (here, the rear case 2) side to position the core part 4 and on the holder 6. The unit cells 7a and 7b and the PCBA 5 are provided as means for positioning.

On the other hand, the resin 70 disposed inside the battery pack 1 is a potting agent that is cured after being charged with a predetermined resin composition, and securely fixes a power generation element such as the core component 4 inside the exterior case. At the same time, it is used to insulate parts from each other. Further, it is also used as a heat conduction means for absorbing the drive heat generated in the battery pack 1 at the time of driving and conducting heat to the outer surface of the outer case to efficiently radiate heat. Furthermore, by using a flame retardant resin as the resin material, the battery pack 1 can be made explosion-proof. Here, a reactive curable resin is used as the resin 70. As this reaction curable resin, any resin such as silicone resin, modified silicone, and epoxy is suitable. The resin 70 is not limited to a reaction curable resin, but is preferably a resin that balances insulation, thermal conductivity, and flame retardancy. From this viewpoint, it is preferable to use a resin material such as a reaction curable resin material or a low temperature molding resin material.
(About the effect of the battery pack 1)
Here, in the battery pack 1, the ribs 25 a to 25 c and 26 a to 26 c forming the rib groups 25 and 26 of the inner wall 24 of the rear case 2 and the ribs 63 a to 63 e in the rib groups 63 to 65 and 67 of the holder 6. 64a to 64d, 65a, 65b, 67a to 67e, 69a to 69e, and a rib 66 (hereinafter simply referred to as “vertical ribs”), the main surfaces of which extend in parallel along the Z direction. It has the characteristic which is. In the potting process, when the resin composition is filled in the battery pack 1, the main surfaces of the vertical ribs 25a to 25c,... Are in contact with the resin liquid surface direction (XY direction). It was adjusted as follows. By using such vertical ribs 25a to 25c, ..., when the resin liquid surface and each rib first contact, the contact area is reduced as much as possible, and the generation of bubbles that may occur at the time of contact is effectively achieved. It is reduced.

  For this reason, in the battery pack 1, the gap between the outer case and the core component 4 including the rear case 2 and the front case 3 is densely filled with the resin composition by highly preventing the generation of bubbles in the potting process. 70 is formed. Thereby, in the battery pack 1, the insulation of the components in the core component 4 can be effectively exhibited, and high safety is realized.

  Further, since the dense resin 70 exists between the unit cells 7a and 7b and the outer case in this way, the heat generated in the unit cells 7a and 7b during driving is quickly absorbed into the resin 70 side and absorbed. Heat is dissipated from the outside of the outer case. Due to this good heat conduction effect, the battery pack 1 can be driven stably while preventing overheating, and excellent battery performance can be expected over a long period of time.

In the battery pack 1, as shown below, in the potting process, the resin composition does not overflow to the outside and is well injected into the outer case without being excessive or insufficient. For this reason, the battery pack 1 has a very high appearance quality, the potting process is performed with high filling efficiency, and various effects of the resin 70 described above can be obtained satisfactorily.
The partition rib 68 is a rib extending in the Y direction, but this is a configuration intended to suppress the generation of bubbles. That is, if a plurality of vertical ribs are arranged at regular intervals instead of the partition ribs 68, the opposing side surfaces of the adjacent unit cells 7a and 7b, the second surface 61 of the holder 6, and the vertical ribs Since the surfaces facing the five surfaces of both main surfaces are in contact with the resin composition, the bubble generation probability increases accordingly. Therefore, the partition rib 68 reduces the contact area with such a resin composition, and reduces the generation of bubbles in the resin composition.
(Manufacturing method of the battery pack 1)
Hereinafter, the manufacturing method of the battery pack 1 will be described focusing on a potting process which is a main characteristic part of the present invention.

(A) Manufacturing Process of Rear Case 2 and Front Case 3 The discharge terminal 30 is disposed on the main body of the front case 3 and the charging terminal 20 is disposed on the main body of the rear case 2. Predetermined wiring is performed for the terminals 20 and 30 inside the cases 2 and 3. Thereby, the front case 3 and the rear case 2 are produced.
A latch 33 is further provided in the rear case 2.

(B) Manufacturing process of core component 4 Next, the charging terminal lead 9 arranged on the front case 3 is connected to the PCBA 5 by direct welding.
The PCBA 5 is disposed on the claw 69 with respect to the first surface 60 of the holder 6. Subsequently, the lead members 10 to 12 are connected to the unit cells 7 a and 7 b by direct welding, and the unit cells 7 a and 7 b are assembled to the second surface 61 of the holder 6, and the lead members 10 to 12 are soldered to the PCBA 5. Weld. Thereby, the core component 4 is produced.

The charging terminal lead 9 is connected to the charging terminal of the front case by direct welding.
(C) Housing Step of Core Component 4 Next, the core component 4 is accommodated in the rear case 2 as shown in FIG. And the charge terminal lead distribute | arranged inside the rear case 2 is connected with the connection terminal 13 of PCBA5 by solder welding. Care is taken to ensure that the core component 4 is positioned inside the rear case 2 by the holder 6 and the vertical ribs 25 a to 25 c of the rear case 2. Thereafter, the periphery of the front case 3 is fitted to the periphery of the opening of the rear case 2, and the peripheral edges of both are welded by ultrasonic welding or the like.

(D) Potting process In this process, the process is divided into two sub-processes (resin filling sub-process and resin curing sub-process) as follows.
(D-1) Resin Filling Sub-Step First, the rear case 2 is held upright with the end face on which the filling port 22 and the exhaust port 23 are disposed facing upward. As shown in FIGS. 5 and 6A, the ends of the pipe bodies (funnels) 8a and 8b are inserted into the filling port 22 and the exhaust port 23 of the rear case 2 along the Z direction, respectively.

  In this state, a resin supply pipe is inserted into the funnel 8a from the outside, and is made fluid by a predetermined heat treatment, and is made of a two-component material (for example, at least one of silicone, modified silicone, and epoxy) The reaction curable resin composition) is poured into the gap between the outer case and the core component 4 while being mixed. At this time, depending on the filling amount of the resin composition, attention is paid to the pouring speed so that the air is appropriately exhausted from the funnel 8b of the exhaust port 23. Also, care should be taken not to drop the funnel 8b from the exhaust port 23 due to the momentum of exhaust. By such an operation, the resin composition is filled from the bottom of the outer case with the resin liquid level rising substantially parallel to the XY plane with the Z direction as the liquid level movement direction (FIG. 6A).

  Here, in the battery pack 1, since both the filling port 22 and the exhaust port 23 are provided on one end surface above the rectangular parallelepiped outer case (rear case 2), the resin filling and exhaust operations are performed on the one end surface. It can be performed efficiently and an improvement in the overall work efficiency of the potting process can be expected. Moreover, since the main surfaces of the vertical ribs 25a to 25c,... Are arranged perpendicular to the planar direction of the one end surface, the flow of the resin composition between the vertical ribs 25a to 25c,. Can also be quick and smooth.

  When the viscosity of the resin composition is relatively high, the liquid level of the resin filled in the exterior case may be smoothly inclined toward the exhaust port 23 with the point directly below the fill port 22 as a vertex. Even in such a case, since the exhaust port 23 is provided on the upper end surface of the rear case 2 (pack battery 1), the exhaust port 23 is not clogged with the resin composition in the middle of filling, so There is an effect that the potting process can be carried out satisfactorily while exhausting air efficiently until just before the completion of filling.

  And in this resin filling sub-process, each of the vertical ribs 25a to 25c provided for the rear case inner wall 24 and the holder 6 in contact with the resin composition is in the Z direction (liquid level movement direction). ), The liquid surface comes into contact with the thin thickness side portions of the vertical ribs 25a to 25c,. For this reason, generation | occurrence | production of a bubble is reduced effectively compared with the past which the main surface of a rib and the resin liquid level contact first. Moreover, the resin composition can smoothly flow between the vertical ribs 25a to 25c forming the rib groups 25, 26, 63 to 65, and 67, and is quickly and uniformly filled (FIG. 6 ( b)).

Here, conventionally, when there are many uneven shapes of parts parallel to the resin liquid level, the area of the parts that are in contact with the rising resin liquid level at a time becomes relatively wide, and bubbles tend to remain.
Here, FIG. 7 is a partial cross-sectional view of the battery pack showing how bubbles are generated in the resin (potting agent) after the potting process in the conventional battery pack. As shown in this figure, if the shape of the positioning ribs of the core part is a shape having a main surface parallel to the resin liquid surface, air easily accumulates at the root portion (rising portion) of the rib, Bubble generation often occurs.

  Therefore, in the battery pack 1, by using the vertical ribs 25a to 25c as described above, the generation of bubbles is reduced by reducing the area of parts where air accumulates (in other words, the area in contact with the resin liquid surface). It has been devised so that potting can be performed with high precision and prevention. Further, by arranging a plurality of the vertical ribs 25a to 25c,... And constituting the rib groups 25, 26, 63 to 65, 67, a rectifying effect of the fluid resin composition can be expected. It can be expected that the potting process is carried out relatively quickly while preventing the turbulent flow of the resin composition. In the present invention, the plurality of vertical ribs 25a to 25c,. Generation | occurrence | production can be prevented effectively and it will be thought that resin 70 can be arrange | positioned favorably.

On the other hand, in the manufacturing process of the present invention, by using the funnel 8a, the resin composition supplied from the resin supply pipe can be correctly filled inside the outer case, and the resin composition adheres to the outside of the outer case and deteriorates the appearance quality. Can be prevented appropriately.
Further, conventionally, when the viscosity of the resin composition is high, there has been a problem of overflowing from the exhaust port before the bottom of the exterior case is sufficiently filled with the resin composition. Even if the resin composition overflows to some extent from the opening 23, it can be held inside the funnel 8b, and the problem of adhering to the surface of the outer case and deteriorating the appearance can be prevented. Thereby, the process which wipes off the overflowing resin composition or removes it after hardening becomes unnecessary.

Further, the resin composition held inside the funnel 8b can be dropped again into the outer case and used for filling, and an efficient process can be realized without waste of materials.
Here, by inserting the funnel 8b as a tubular body into the exhaust port 23, the conical inner portion can be effectively used as the resin receiving portion. For this reason, it is possible to prevent the resin composition overflowing from the exhaust port 23 from spilling out, and to hold the resin composition well at the conical inner portion of the funnel 8b. Moreover, since a relatively large amount of the resin composition can be held in the inner portion of a tube body having a relatively long length instead of the funnel 8b, the same effect as when the funnel 8b is used can be expected. .

As described above, in the present invention, by using the funnel 8 (8a, 8b), the resin composition can be prevented from adhering to the outside of the outer case, the high appearance quality of the battery pack can be maintained, and the resin composition can be externally provided. Since a product can be prevented from overflowing and the resin filling property can be improved reliably, a battery pack can be manufactured with excellent manufacturing efficiency.
(D-2) Resin curing sub-step After mixing the two liquid materials as described above at normal temperature (room temperature) and filling the required amount of the resin composition, the temperature is raised to a predetermined temperature, The resin composition is cured by maintaining the temperature for a certain time (when a silicone resin composition is used, for example, held at 65 ° C. for 3 hours). The funnel 8 (8a, 8b) is removed after the resin is filled, and a sealing seal 28 is provided at each of the filling port 22 and the exhaust port 23. When the resin composition is completely cured and the resin 70 is formed, the potting process is completed.

In the above manufacturing process, the method of performing the potting process using the funnel 8 is exemplified. However, the means for filling the resin is not limited to the funnel, and a tubular body having a constant inner diameter or a flexible tube may be used. Good. Further, the potting process may be performed by inserting a funnel into the filling port and inserting the tube or the tube into the exhaust port.
(E) Label sticking process About the battery which passed the said process, a predetermined standard certification | authentication test is done and the rating label 31 is stuck to the front case 3. FIG.

Thus, the battery pack 1 is completed.
<Other matters>
In the battery pack 1, the ribs for positioning the core component 4 in the outer case are configured as the vertical ribs 25 a to 25 c... The ribs used for positioning of each lead member can also be configured as vertical ribs. It is desirable to form as many ribs as possible in contact with the resin composition in the outer case as vertical ribs, because the generation of bubbles can be satisfactorily prevented during the potting process.

  The present invention can be widely used as a manufacturing method of a battery pack used for a main power source of a small electronic device such as a portable computer such as a notebook computer and PDA, a portable DVD player, a portable GPS, and a transceiver. Or it can apply also to the manufacturing method of the pack battery used for comparatively big apparatuses, such as a power assist bicycle and an electric tool. Since the battery pack obtained by the manufacturing method is appropriately potted, there is very little risk of ignition at the time of malfunction, and it is very safe, so it can be used widely. In addition, the size of the battery pack can be set freely, and its applicability is extremely large.

1 battery pack 2 rear case 3 front case 4 core parts 5 PCBA (assembled protection circuit board)
6 Holder 7a, 7b Cell 8 (8a, 8b) Funnel
9 Discharge terminal lead 22 Filling port 23 Exhaust port 24 Rear case inner wall 25, 26, 63-65, 67 Rib group 28 Sealing seal (PET seal)
25a-25c, 26a-26c, 63a-63e, 64a-64d, 65a, 65b, 66, 67a-67e, 69a-69e Vertical rib 70 Resin (potting agent)

Claims (6)

The power generation element in which the unit cells are arranged is stored in an exterior case, and the potting process in which a fluid resin composition is filled in the gap between the exterior case and the power generation element and cured to perform potting. A battery pack manufacturing method comprising:
In the potting process,
Using an exterior case provided with a filling port and an exhaust port, the first tube body is inserted into the filling port, and the second tube body is inserted into the exhaust port from the outside,
A resin filling sub-step of filling the resin composition from the filling port through the first pipe body and exhausting the inside of the case from the exhaust port through the second pipe body;
A resin curing sub-process for curing the resin composition after filling, and removing the first tube and the second tube inserted in the exterior case to seal the filling port and the exhaust port. A method for manufacturing a battery pack. The method for manufacturing a battery pack according to claim 1, wherein the outer case used in the potting step has a rectangular parallelepiped shape, and the filling port and the exhaust port are provided on the same end surface of the outer case. The method for manufacturing a battery pack according to claim 1, wherein a power generation element including a holder is used as the power generation element. The method of manufacturing a battery pack according to any one of claims 1 to 3, wherein a power generation element including a circuit board is used as the power generation element. 5. The battery pack according to claim 1, wherein in the filling sub-step, the resin composition that has risen from the inside of the outer case to the inside of the second tubular body is dropped into the gap. Production method. The method for producing a battery pack according to any one of claims 1 to 5, wherein in the potting step, at least one of a silicone-based resin, a modified silicone-based resin, and an epoxy-based resin composition is used as the resin composition.

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